Pneumatic core-wire puller



B. S. AIKMAN. PNEUMATIC com WIRE PULLER.

APPLICATlON FILED DECsS. |918.

Patented June 15, 1920.

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BURTON S. AIKMAN, `OF-MILWAUKEE, WISCONSIN, ASSIGNQR T0 NATIONAL BRAKE &

ELECTRIC? COMPANY, 0F MILWAUKEE, 'VJISCONSIIL PNEUMATIG CGREVIRE FULLER.

Specification `of Letters Patent.

Application filed December S, 1918. Serial No. 265,134.

1/ '0 all whom t may concern.'

Be it known that l, BURTON S. AIKMAN, a citizen of the United States, residing at Mil waulree, in the county of Milwaukee and State of Wisconsin, have invented new and useful Improvements `in Pneumatic CorelVire Fullers, of which them/following is a specication.

This invention relates to devices for pulling core p wires out of castings, and ythe principal object of my invention is to provide a fluid pressure operated machine for the above purpose.

Heretofore, core wires have been drawn from castings manually, which process is very slow and tedious and often requires considerable physical effort.

Furthermore, it is sometimes physically impossible for the operator to pull the core wire out by a straight pull, with the result that the core wires are often twisted and broken, so that the wires cannot be used again.

By employing a machine in accordance with my invention, very little physical eflort is required to draw the core wires, the rapidity of operation is greatly increased, and the wires are pulled straight, so that a much greater percentage` of the wires can be used again.

ln the accompanying drawing; Figure 1 is a sectional view of a core wire pulling machine constructed in accordance with my invention; F ig. 2 an end view thereof; and Fig. 3 a. part sectional view of a casting containing core wires, showing how the clamping jaws of the core wire pulling machine take hold of the core wires.

According to the construction shown in the drawing, the machine may comprise a main pulling cylinder 1, containing a piston 2 having a piston stem 3, which projects rearwardly through a cylinder cup l.

Pull rods 5 are mounted on opposite sides of the cylinder 1 and are secured to a cross head 6 carried by the rear end of the piston stem 3. The pull rods 5 extend forwardly beyond the cylinder 1 and at the forward ends have a fixed clamping jaw 7 secured thereto and therebetween.

A movable clamping jaw 7 is pivotally mounted on the fixed jaw 6 and is adapted to be operated by an arm 8 pivotally secured to a piston stem 9 of a piston 10 contained in a clamping cylinder 11.

'lhe cylinder 11 is secured tobrackets 12 which in turn are secured to thepull rods 5, so that the clamping cylinder moves with said rods. .i l

Extending vertically on `opposite sides of the clamping jaws 6 and are yolres 13, which are secured to the pressure head of cylinder 1 and serve to hold the casting against rearward movement while the core wires are being pulled. Said yolres may be braced apart by means of a crossbarA 14, sen cured thereto.

Fluid under pressure is supplied to piston 10 through a pipe 15, apipe 16, and a flee ible hose 17, which permits movement of the cylinder 11,` and the supply of fluid to pipe 15 from a source of fluid supply pipe 18 may be controlled by a valve 19 adapted to be operated by a foot treadle 20.

T he supply of fluid under pressure to the main pulling piston 2 is controlled by a valve 21 adapted to be operated by a diaphragm 22, subject on one side to fluid pressure supplied to pipe 16 and on the opposite side to the pressure of a spring 23.

In operation, a casting containing core wires, such as the casting 24 shown in Fig. 3 is applied to the machine, so that the er;- posed ends of' the core wires 25 rest on top of the liXed jaw 6.

The treadle 2O is then depressed, so as to open valve 19 and permit the flow of fluid from pipe 18 to pipe 15 and thence through pipe 16 and the ilexible hose 17 to cylinder 11.

The piston 10 is then moved forwardly, causing the jaw 7 to firmly clamp the core wires 25. lhen the fluid pressure in pipe 16 has reached a predetermined degree, sufficient to give the desired clamping pressure on the core wires, through the action of piston 10, the diaphragm 22 is adapted to be operated by the liuid pressure in said pipe, so as to open the valve 21 and permit the flow of duid through pipe 26 to the piston 2. Said piston is thereupon shifted rearwardly, causing the rearward movement of the pull rods 5 and the clamping jaws. rlhe casting 24 is held against rearward movement by engagement with the yokes 13, so that the clamping jaws operate to pull the core wires 25 out of the casting.

When the core wires have been pulled, the parts are returned to normal position by permitting the valve 19 to close, at the same n conroaarron orwsooNSIN. y

Patented J une 15, 1920.;

time opening an atmospheric vent treni pipe 15 around the stem 27 of'valve 19.

, Fluid Vis thus released from piston l and Y also from piston 2 through pipe 28, containing a check valve 29,' VAfor preventing` flow of fluidfrom pipe to pipe 28. The pistons 2 and 10 are then returned to release position by their respective springs and 31 and the core wires are released from the clamping jaws. f

Pressure gages 32 and 33 Vmay be connected to the cylinders ll and l, so that'the fluid pressure attained in the cylinders may be noted when desired.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent is l. In a core wire pulling machine, the

combination with a cylinder, a piston therein operated by uid under pressure ior supplying power for pulling the core wires, and clamping jaws movable by said piston and adapted toV grip the core wires, of a second cylinder and a piston therein, operated by fluid under pressure, i'Eor 'actuating' said jaws, and means for first supplying fluid under pressurel to the second cylinder and then automatically to the first cylinder.

2. In a core wire pullingmachine, the combination with a cylinder, a piston there- ,vor

in operated by fluid under pressure for su psupplying power for pulling the cor-e wires,

of'a yoke movable with said piston, a second cylinder mounted on p said yoke, a piston Vthereinoperated by fluid under pressure,

and means operated by'said piston Yfor grip.- ping the core wires. i

1I. In a core wire pulling machine, the combination with clamping jaws tor gripping the core wires in a casting, acylinder, a piston therein. for operating saidY jaws te pull the core wires, a'second Cylinder', and a piston therein for operating said jaws. to grip the core wires`o stop members iior resisting movement of the casting upon pull'- ing the core wires therefrom.

In testimony whereof I have hereunto set m hand.

y BURTON S. AIKMAN. 

